SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '426866251ed6759243616d0b4d24c6e05eb04d7f796fcbc83fae3d8da8f39108' 
  AND token = 'mBsRvgauYqzN6QKCYAZLnbhSJj3drA34eCw31Pd1EMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}